The access rules (Clause [class.access]) for a virtual function are determined by its declaration and are not affected by the rules for a function that later overrides it. [ Example:
class B {
public:
virtual int f();
};
class D : public B {
private:
int f();
};
void f() {
D d;
B* pb = &d;
D* pd = &d;
pb->f(); pd->f(); }
— end example ]
Access is checked at the call point using the type of the expression used to denote the object for which the member function is called (B* in the example above). The access of the member function in the class in which it was defined (D in the example above) is in general not known.
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